Psalms 40:8 - Wesley's Explanatory Notes

I delight — This is eminently true, of Christ, and is here observed as an act of heroic obedience, that he not only resolved to do, but delighted in doing the will of God, or what God had commanded him, which was to die, and that a most shameful, and painful, and cursed death. My heart — I do not only understand it, but receive it with heartiest love, delighting both to meditate of it, and to yield obedience to it.